Biology 9700 · AS & A Level · The gas exchange system

The gas exchange system — practice question

Fig. 3.1 shows a photomicrograph of a transverse section through part of the bronchus wall in the gas exchange system.
(a)[3]

Identify the tissues J and K shown in Fig. 3.1, and suggest how the wall of a bronchiole is different from the wall of the bronchus for these two tissues. J K difference

(b(i))[1]

State the name of the pathogen responsible for TB.

(b(ii))[1]

Name the part of the monoclonal antibody that attaches to the protein from the pathogen.

(b(iii))[2]

Use the information in Fig. 3.3 to suggest and explain why this test is specific for TB.

(b(iv))[2]

Suggest how the structure of immobilised monoclonal antibodies in area 3 is different from the structure of the immobilised monoclonal antibodies in area 4.

(c)[3]

Explain how memory T-lymphocytes provide protection against TB in a person who has received a BCG vaccination.

(d(i))[1]

Name the process used by the tumour cells to take in the weakened pathogens.

(d(ii))[3]

Suggest how antigen presentation by tumour cells triggers an immune response that results in the destruction of the tumour cells.

Worked solution & mark scheme

This 16-mark question has a full step-by-step worked solution and mark scheme. One marking point: Cartilage identified (J)

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